Shock tube/laser absorption measurement of the rate constant of the reaction: H 2 O 2+CO 2 2OH+CO 2

We address the role of the linear mixing rule in the kinetics of the H 2 O 2 decomposition system by reporting the rate constant for H 2 O 2 + M = 2OH + M (M = Ar and CO 2 ) in the temperature range of 1087-1234 K at low pressures in a mixture of 20% CO 2 in Argon. The reaction rate constant was inferred from H 2 O concentrations monitored by using a laser-absorption spectroscopy-based water diagnostic. To the best of our knowledge, this is the first measurement of the rate constant of this reaction in a mixture to be reported in literature. A significant discrepancy was found between the rate constants derived using the traditional linear mixing rule and the reduced pressure linear mixing rule. This discrepancy can have serious implications on the predictive accuracy of these kinetic models, especially under conditions relevant to the operation of supercritical CO 2 (sCO 2 ) power cycles that rely on oxy-fuel combustion in a working fluid comprised almost entirely of CO 2 .& COPY; 2022 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Automated summary

We investigate the kinetics of the H2O2 decomposition system and find a significant discrepancy between the rate constants derived using the traditional linear mixing rule and the reduced pressure linear mixing rule. This discrepancy can have serious implications on the predictive accuracy of kinetic models, especially in conditions relevant to the operation of supercritical CO2 (sCO2) power cycles that rely on oxy-fuel combustion in a working fluid comprised almost entirely of CO2.